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Viewing file:     index.js (2.29 KB)      -rw-r--r--

import isWeekend from "../isWeekend/index.js";
import toDate from "../toDate/index.js";
import toInteger from "../_lib/toInteger/index.js";
import requiredArgs from "../_lib/requiredArgs/index.js";
import isSunday from "../isSunday/index.js";
import isSaturday from "../isSaturday/index.js";
/**
 * @name addBusinessDays
 * @category Day Helpers
 * @summary Add the specified number of business days (mon - fri) to the given date.
 *
 * @description
 * Add the specified number of business days (mon - fri) to the given date, ignoring weekends.
 *
 * @param {Date|Number} date - the date to be changed
 * @param {Number} amount - the amount of business days to be added. Positive decimals will be rounded using `Math.floor`, decimals less than zero will be rounded using `Math.ceil`.
 * @returns {Date} the new date with the business days added
 * @throws {TypeError} 2 arguments required
 *
 * @example
 * // Add 10 business days to 1 September 2014:
 * const result = addBusinessDays(new Date(2014, 8, 1), 10)
 * //=> Mon Sep 15 2014 00:00:00 (skipped weekend days)
 */

export default function addBusinessDays(dirtyDate, dirtyAmount) {
  requiredArgs(2, arguments);
  var date = toDate(dirtyDate);
  var startedOnWeekend = isWeekend(date);
  var amount = toInteger(dirtyAmount);
  if (isNaN(amount)) return new Date(NaN);
  var hours = date.getHours();
  var sign = amount < 0 ? -1 : 1;
  var fullWeeks = toInteger(amount / 5);
  date.setDate(date.getDate() + fullWeeks * 7); // Get remaining days not part of a full week

  var restDays = Math.abs(amount % 5); // Loops over remaining days

  while (restDays > 0) {
    date.setDate(date.getDate() + sign);
    if (!isWeekend(date)) restDays -= 1;
  } // If the date is a weekend day and we reduce a dividable of
  // 5 from it, we land on a weekend date.
  // To counter this, we add days accordingly to land on the next business day


  if (startedOnWeekend && isWeekend(date) && amount !== 0) {
    // If we're reducing days, we want to add days until we land on a weekday
    // If we're adding days we want to reduce days until we land on a weekday
    if (isSaturday(date)) date.setDate(date.getDate() + (sign < 0 ? 2 : -1));
    if (isSunday(date)) date.setDate(date.getDate() + (sign < 0 ? 1 : -2));
  } // Restore hours to avoid DST lag


  date.setHours(hours);
  return date;
}